Drilling mechanism



Oct. 25, 1932. E. G. GARTIN v DRILLING MECHANISM Original Filed Oct. 2'7, 1924 ww mm 1%7/06922'011' EZme-r 46212 2!) 7% A Wm \isk in IUNITEDSTATES a; iana;

My invention relates to drilling. mechanisms and; particularly to hole cleans ng meanswtherefor. .Thisapplicat-ion is; a div sion of mytcopending application ISer. No. {6 746,2l2 fi1ed Oct.27, 1924:? i

1 An objectof myfinvention is to provide an improved drilling mechanism. 1 Another object is to provide improved hole cleanslng means for such a mechanism. Still another *object is to provide improved controlling means for the fluid distribution valve 01' a pressure fluid actuated drilling mechanism to hold the distribution valve in one positlon ,todirect alflow of pressure fluid to only the forward end of the motor so :as to permlt a supply of live pressure fluid to flow to the hollow drillsteelto cleanse the hole. A further objectis tofprovide improvedflpressure fluidoperated mechanism forcontrolllng the distribution valveof a drilling mechanism to effect ahole blowing operation. These and otherobjects and advantagesof my 1nven tion willhereinafter more fully appear. In the accompanying drawing I have shown for purposes ofjillustration one. formit which my invention may assume in practice. In the drawing,.- i Fig. 1:. is a ,side elevation of a drilling mechanism in which my improved valve controlling and hole cleansing means is embodied, the View being shown partlally in .central longitudinal section. I r

i Fig. 2 is aniendf elevational view of the mechanism shown in Fig. 1. i L. Fig. 3 is a developed longitudinal section.

taken substantiallyon line 3-3 ofFig. 2.

Inthe illustrative; form of my invention there is shown a drilling mechanism generalsly designated 1 comprising a cylinder 2 hav 0 inga bore 3 inwhichya hammer piston 4 1s -reciprocable. Theha'mmer piston 41: isprol. vided with a forwardly projecting striking bar 5 adapted toaotuate a hollow drillsteel 6 carriedby theforward end of the drilling mechanism in a. usual manner. The forward end of the cylinder 2isin communication at. the end ofevery rearward stroke withthe bore ofthe drill steel 6 by-wayof the usual [drill steelrotation flutes 7 in thestrikingbar 4,. of the piston. The upper surface of the cyltion by means of transverse springs 16 and co- {PATENTTOFFICE as summons; NEW massin AssIGNon T10 sunmvniv Y mnoinnnn roomrnnv, A CORPORATION on vrnssncnusn'rrs 1 DRILLING MEoHAnIsM v 23,1928. SerialNo. 256,277.

filed October-27, 1924, Serial No. 546,242; Dividedand this application filed February inder has a valve chest 8 formed integral therewith having a longitudinallyextending. bore 9iin which is mounted a pair of-interchangeable sleeves 10 and 111 The sleeves 10 andll are each provided withsteppedbores 121and 13, the bores 12 having their 'outen ends closed by usual vented buffer plugs 14 and 15. The sleeveslO and 11 and the buffer plugs are held in operative assembled relaoperating side rods 17. A fluid distribution valve 18, herein of the wellknownthree spool differential type, is disposed withinbores 12 and 13 and is adapted alternately to control the supply of pressure fluid to the drilling ing with the opposite ends of the cylinderand alternately to control the-exhaust fromthe opposite ends oi thecylinder to the passages 20 and 21 by means of passages 22 and 23 com- Inunicating with the atmosphere. The usual valve throwing passages 24 and 25-communi" .cate at longitudinally spaced points with the cylinder bore 3 and with the bores 12 at the ply connection 31 through passages not shown to the supply passage 19 formed in the valve chest in the usual manner. i i p In my improved construction it will here a in be observed that the forward bufi'erplug 15 is provided with a longitudinally extending bore 32 in which a suitable piston 33 is dis posed, the diameter of the piston 33 being greater than-that of the spools of the valve 18. The piston 33 is provided withaj longitudinally rearwardly extending stem 3t adapted to engage the forward end ofithe valve18. A reduced bore 35 is formed in the buffer 15in which a spring 36 is disposednor mally tending to hold the piston 33 inits extreme forward inoperative position against the inner surface of a plug 37 which closesthe forwardend of the bore 32. The rear end of b ,thefbore 32 is vented to the atmosphere by 65 motor from the supply passage 19 through the 3 distribution passages 20 and 21 communicatmeans of a small port 38 (see Fig. As illustrated, the rear bufler plug 1a is provided with a longitudinally extending port 39 which communicates with the bore 12 at the rear end of the valve 18 and with a laterally disposed bore 40 respectively, which is threadedly engaged, as at 41, by a valve casing 42. The valve casing 12 is provided with a longitudinally extending portion 43 in which a longitudinal bore ll is formed and the portion 43 is secured at a5, herein by brazing, to a pipe connection 1-6 communicating with a radially extending port i? which, in turn, communicates with the forward end of the bore 32 formed in the forward buffer plug 15. A cylindrical valve d8 is slidable in the bore 44 and this valve is provided with a stem 19 and an operating member or push button 50 located adjacent the throttle valve 30. A spring 51 is disposed between the valve casing 4 2 and the push button 50 and this spring normally tends to hold the valve 48 in its extreme rearward inoperative position. The valve 48 is provided with a passage 52 which is adapted to connect the bore lO formed in the plug 1% with the forward end of the bore 44 which communicates with the bore 32. The bore a l is provided with a laterally extending vent port 53 which is adapted to connect the forward end of the bore 32 with the atmosphere when the valve -8 is in its inoperative position. It will here in be noted that the stem 34 of the piston 33 is flattened or cut away at 5a to vent the end of the valve, in the usual manner, to the atmosphere through the bores 35 and 32 and the vent passage 38.

In the operation of this form of my improved valve controlling and hole cleansing means it will herein be noted that when it is desired to cleanse the hole the operator manipulates the push button 50, moving the valve 43 to the right, indicated in Fi g. 3, opening communication between the bore 12 at the rear end of the valve 18, which bore communicates with the cylinder bore 3 by means of the throwing passage 24, and with the forward end of the bore by means of the pipe connection 46, thus causing the piston 33 to be moved to the left, the stem 34 en gaging the forward end of the valve at this time, consequently causing the valve 18 to be snifted rearwardly and held in its extreme rearward position against the rear bur'l'er plug 14, see Fig. 3. This causes the pressure fluid to flow from the supply passage 19 past the forward su face of the central spool ofhe valve and through the passage 21 communicating with the forward end of the cylinder bore. The pressure fluid acting on the rear end of the piston l is exhausted to atmosphere through the passage 20 and the passage 22 at this time. This causes the pressure fluid within the forward end of the cylinder bore to hold the piston 4 in its e2:-

treme rearward position and also causes pres= sure fluid to flow from the forward end of the motor by way of the usual drill steel rotation flutes 7 formed in the striking bar 5 through the hollow drill steel to cleanse the hole. When the push button 50 is released the pressure fluid in the forward end of the bore 32 is ventedto atmosphere by way of the vent port 53 communicating with the bore la in the valve casing 42, consequently causing the spring 06 to force the piston and the stem 3d forwardly to its inoperative position, the valve 18 again resuming its normal fluid distributing operation at this time.

As a result of my improvement it will hereinbe noted that improved valve controlling and hole cleansing means is provided wherein the valve may be held in inoperative position and the flow of pressure fluid directed through the forward end of the motor" through the hollow drill steel to cleanse the hole. It will further be noted that improved pressure fluid actuated valve controlling and hole cleansing means is provided which is of an exceedingly simple and compact character and which may be applied to a drilling mechanism standard form with a minimum of change and expense.

l Vhile I have in this application speciflcally described one form which my invention may assume in practice, it will be understood that this form of the same is shown for pur poses of illustration and that the invention may be modified and embodied in various other forms without departing from its T77:

spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a fluid actuated rock drill, the combination with a tool actuating motor including a cylinder and a hammer piston reciprocable therein, fluid distribution means for effecting reciprocation of said piston including a valve chest, a fluid actuated fluid distributing valve therein controlling fluid distribution for opposite ends of said cylinder bore and means for conducting pressure fluid from said cylinder to said valve chest to effect throwing of said valve and including a valve H throwing passage leading from one end of said valve chest to said cylinder adjacent its forward end, a hollow tool adapted to be actuated by said piston, and means for establishing communication between the forward end of said cylinder and the bore in said tool when the piston is held in its rearward position, of a hole blowing device comprising pressure fluid operated means relative to which said fluid distributing valve is movable during its normal operation for positively shifting said valve against the resisting throwing pressure and holding said valve in one position to effect a hole blowing operation by continuous supply of pressure fluid to the forward end of said cylinder, and :73

means under manual control for admitting pressure fluid from said throwing passage i in tion between the forward end of said Cylllh to said pressure fluid operated meansfor .eifecting ahole blowing operation. 7 i 2.111 a fluid ctuated rock drill, the combination with a tool actuating motor 7 ineluding a cylinder having a bore and a piston reciprocable therein, fluid distribution means for effectingreciprocation of said pis-f ton including a valve chest, a: fluid actuated fluid distributing valve therein for controlling supply and exhaust of motlve fluid to y l and from opposite ends of said cylinder'bore and means for conducting pressure fluid from said cylinder boreto said valve chest to eflectthrowing of said valve including a' throwing passage leading from one end of said valve chest to the forward end of said" cylinder, a hollow tool actuated by said piston, and means for establishing communicaif der and the bore in saidtool when saidpiston is in the rearend of said cylinder, of a hole blowing device including a pressure fluid actuated element relative to which said valve is movable during its normal operationand adapted upon the application of pressure to shift said valve against thereQ sisting throwing pressure and hold said valve immovable 1n POSltlOll to cause continuous supply of pressure fluid to the for;

ward end of the cylinder for eflecting a hole blowing operation, aconduit leading from said end ofthe valve chestto said fluid actuated element for supplying pressure fluid to said element from said'throwing passage, and a. manually controlled valve forcontrolling flow of fluid through said conduit.

3. In a fluid actuated rock drill,the combination as specified in claim 2 wherein said valve comprises a spring pressed plunger element slidably mounted in said conduit adjacent the rear end of said valve chest,

means for permitting flow of pressure fluid through said conduit to said element when said valve is depressed, and means for exhausting said fluid actuated element upon release of said plunger valve.

l at. In a fluid actuated rock drill, thecombination with a tool actuating motor includ ing a cylinder having a bore and a piston reciprocable'therein, fluid distribution means for effecting reciprocation of said piston ineluding a valve chest having a valve chamher, a fluid actuated fluid distributing valve in said valve'chamber for controlling supply andexhaust of motive fluid to and from op posite ends of said cylinder bore and means GO inder bore to said valve cliamber'to efl'ect throwing of said" valve including a throwing for conducting pressure fluid from said cylpassage leading from said valve chamber to i said cylinder, and ahollow tool actuated by c said piston, said motorhaving associated therewith means for establishing communication between the forward end of said cylinder and the bore in said tool when said pis ton is in the rear end of said cylinder, of a hole blowing device lncludlng a pressure fluid actuated elementrelative to which said valve is movable during its normal operation and arranged upon application of pressure thereto to shift said valve against the resisting throwing pressure and hold said valve immovable in position to cause a continuous suply of pressure fluid to the forward end of the cylinder foreflecting a hole blowing operation, a cylinder in which said element is contained, a conduit separate from said fluid distribution means ,leading from said valve chamber to said last mentioned cylinder for supplying pressure" fluid to said last mentioned cylinder to effect actuation of said element, and a manually controlled valve for controlling flow of fluid through said conduit.

5. In a fluid actuatedrock drilling mechanism,'.the combination with a hollow tool and a tool actuating motor therefor including a cylinder having a bore with a piston reciprocable therein, fluid distribution means for effeotlng reciprocat on of sa1d plstonineluding a valve chest, a fluid actuated distributing valve therein, and meansfor effecting opposite movements of said valve including throwing passages extending from points in said cylinder bore at opposite sides of the longitudinal center ofthe latter to opposite ends of said valve chest, and means operative when said piston is in its rear most position for connecting the forward end of the cylinder bore with the hollow tool,

jected to pressure admitted through said last mentioned passage, for holdingsaid valve in position to admit to the forward end of the cylinder. In testimony whereof I afflX my signature.

ELMER e. GARTIN. 

